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Ransomware is a kind of malware that encrypts all the files on a victim’s computer to extort money in return for restoring access. The deadly WannaCry ransomware, which took place in May 2017, infected more than 300,000 computers in at least 150 countries and brought businesses to a complete standstill, costing them as much as $4 billion in losses. Back up your files is one of the best ways to counter ransomware, backing up your data with backup.